For the following statements, answer increase, decrease, or stay the same and ex

Question

For the following statements, answer increase, decrease, or stay the same and explain your answer. If it could be any of them, describe the situations which would cause each type of change to occur. You should reference appropriate equations in your explanations for lull credit. Entropy of steam through an actual adiabatic turbine will (increase, decrease, stay the same). The entropy of ideal air will (increase, decrease, stay the same) during an isothermal expansion. The entropy in an internally reversible process will (increase, decrease, stay the same). A piston-cylinder device contains Nitrogen gas. During a reversible adiabatic process, the entropy of nitrogen will (increase, decrease, stay the same). In an actual heat transfer process where heat is removed from the system, the entropy will (increase, decrease, stay the same).

Explanation / Answer

a) increase (since frictional effects are present)

b) stay the same (the propertiesof ideal air are only dependent on temperature)

c) increase (heat transfer may still occur through finite temperature difference)

d) stay the same (no heat transfer occurs and also no frictional effects are present)

e)may increase or decrease (depends upon the magnitude of entropy change caused due to internal ir- reversibility)

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